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POWhat on earth would compell C++ to call this function?
 

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  1. POWhat on earth would compell C++ to call this function?
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    <p>I'm working on a programming language that uses C++ as it's target language for now. I'm hitting an exceptionally strange backtrace.</p> <pre><code>#1 0x08048d09 in factorial (n=0x8052160) at ir.cpp:35 35 shore::builtin__int * __return = NULL; (gdb) bt #0 shore::builtin__int::__mul__ (this=0x8052160, other=0x8052288) at /home/alex/projects/shore/shore/runtime/int.h:36 #1 0x08048d09 in factorial (n=0x8052160) at ir.cpp:35 #2 0x08048cfa in factorial (n=0x80520b8) at ir.cpp:35 #3 0x08048cfa in factorial (n=0x8052018) at ir.cpp:35 #4 0x08048d6f in main () at ir.cpp:43 </code></pre> <p>Specifically it appears that declaring the type of <strong>return is somehow triggering the __mul</strong> method on builtin__int to be called, and I have no idea why. builtin__int looks like:</p> <pre><code>#ifndef _SHORE_INT_H #define _SHORE_INT_H #include "gc.h" namespace shore { class builtin__int : public shore::Object { public: // Some day this will be arbitrary percision, but not today. long long value; static builtin__int* new_instance(long long value_) { builtin__int* val = new builtin__int(value_); shore::GC::register_object(val); return val; } builtin__int(long long value_) { this-&gt;value = value_; } builtin__bool* __eq__(builtin__int* other) { return builtin__bool::new_instance(this-&gt;value == other-&gt;value); } builtin__int* __add__(builtin__int* other) { return builtin__int::new_instance(this-&gt;value + other-&gt;value); } builtin__int* __sub__(builtin__int* other) { return builtin__int::new_instance(this-&gt;value - other-&gt;value); } builtin__int* __mul__(builtin__int* other) { return builtin__int::new_instance(this-&gt;value * other-&gt;value); } }; } #endif </code></pre> <p>Any ideas as to what on earth is compelling C++ to call the <strong>mul</strong> method?</p> <p>EDIT: Added the source of ir.cpp</p> <pre><code>#include "builtins.h" #include "frame.h" #include "object.h" #include "state.h" std::vector &lt; shore::Frame * &gt;shore::State::frames; shore::GCSet shore::GC::allocated_objects; class factorial__frame: public shore::Frame { public: shore::builtin__int * n; shore::GCSet __get_sub_objects() { shore::GCSet s; s. insert(this-&gt;n); return s; }}; class main__frame: public shore::Frame { public: shore::GCSet __get_sub_objects() { shore::GCSet s; return s; }}; shore::builtin__int * factorial(shore::builtin__int * n) { shore::builtin__int * __return = NULL; factorial__frame frame; shore::State::frames.push_back(&amp;frame); frame.n = NULL; frame.n = n; if (((frame.n)-&gt;__eq__(shore::builtin__int::new_instance(0)))-&gt;value) { __return = shore::builtin__int::new_instance(1); shore::GC::collect(); shore::State::frames.pop_back(); return __return; } __return = (frame.n)-&gt; __mul__(factorial ((frame.n)-&gt; __sub__(shore::builtin__int::new_instance(1)))); shore::GC::collect(); shore::State::frames.pop_back(); return __return; } int main() { main__frame frame; shore::State::frames.push_back(&amp;frame); builtin__print(factorial(shore::builtin__int::new_instance(3))); shore::State::frames.pop_back(); } </code></pre>
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    1. USAlex Gaynor
    1. USAlex Gaynor
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    1. COWithout seeing the code in `ir.cpp`, how would we know?
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      1. POWhat on earth would compell C++ to call this function?
      1. USPavel Minaev
 

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